2 replies

Google Provider prompt parameter type mismatch causes OAuth error

I'm encountering an issue with the Google OAuth provider configuration in better-auth. According to the documentation, to always get a refresh token, I should set prompt to "select_account+consent" as in documentation, but this causes a Google OAuth error.

socialProviders: {
  google: {
    clientId: process.env.GOOGLE_CLIENT_ID as string,
    clientSecret: process.env.GOOGLE_CLIENT_SECRET as string,
    accessType: "offline",
    prompt: "select_account+consent", // As per documentation
  },
},

socialProviders: {
  google: {
    clientId: process.env.GOOGLE_CLIENT_ID as string,
    clientSecret: process.env.GOOGLE_CLIENT_SECRET as string,
    accessType: "offline",
    prompt: "select_account+consent", // As per documentation
  },
},

Error from Google:
Invalid parameter value for prompt: Invalid prompt: select_account+consent
Error 400: invalid_request

TypeScript Issue:
When I try to use the correct Google OAuth format with space separation:

prompt: "select_account consent"
Type '"select_account consent"' is not assignable to type '"select_account" | "consent" | "login" | "none" | "select_account+consent" | undefined'. 
Did you mean '"select_account+consent"'?ts(2820)

prompt: "select_account consent"
Type '"select_account consent"' is not assignable to type '"select_account" | "consent" | "login" | "none" | "select_account+consent" | undefined'. 
Did you mean '"select_account+consent"'?ts(2820)

Google Provider prompt parameter type mismatch causes OAuth error

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